PDF 74LCX245 Data sheet ( Hoja de datos )

Número de pieza	74LCX245
Descripción	LOW-VOLTAGE CMOS OCTAL TRANSCEIVER
Fabricantes	ON Semiconductor
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No Preview Available ! MOTOROLA SEMICONDUCTOR TECHNICAL DATA Low-Voltage CMOS Octal Transceiver With 5V-Tolerant Inputs and Outputs (3-State, Non-Inverting) The MC74LCX245 is a high performance, non–inverting octal transceiver operating from a 2.7 to 3.6V supply. High impedance TTL compatible inputs significantly reduce current loading to input drivers while TTL compatible outputs offer improved switching noise performance. A VI specification of 5.5V allows MC74LCX245 inputs to be safely driven from 5V devices. The MC74LCX245 is suitable for memory address driving and all TTL level bus oriented transceiver applications. Current drive capability is 24mA at both A and B ports. The Transmit/Receive (T/R) input determines the direction of data flow through the bi–directional transceiver. Transmit (active–HIGH) enables data from A ports to B ports; Receive (active–LOW) enables data from B to A ports. The Output Enable input, when HIGH, disables both A and B ports by placing them in a HIGH Z condition. • Designed for 2.7 to 3.6V VCC Operation • 5V Tolerant — Interface Capability With 5V TTL Logic • Supports Live Insertion and Withdrawal • IOFF Specification Guarantees High Impedance When VCC = 0V • LVTTL Compatible • LVCMOS Compatible • 24mA Balanced Output Sink and Source Capability • Near Zero Static Supply Current in All Three Logic States (10µA) Substantially Reduces System Power Requirements • Latchup Performance Exceeds 500mA • ESD Performance: Human Body Model >2000V; Machine Model >200V MC74LCX245 LOW–VOLTAGE CMOS OCTAL TRANSCEIVER 20 1 20 1 20 1 20 1 DW SUFFIX PLASTIC SOIC CASE 751D–04 M SUFFIX PLASTIC SOIC EIAJ CASE 967–01 SD SUFFIX PLASTIC SSOP CASE 940C–03 DT SUFFIX PLASTIC TSSOP CASE 948E–02 Pinout: 20–Lead (Top View) VCC OE B0 B1 B2 B3 B4 B5 B6 B7 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 T/R A0 A1 A2 A3 A4 A5 A6 A7 GND 9/95 © Motorola, Inc. 1996 1 PIN NAMES Pins Function OE T/R A0–A7 B0–B7 Output Enable Input Transmit/Receive Input Side A 3–State Inputs or 3–State Outputs Side B 3–State Inputs or 3–State Outputs REV 3 1 page MC74LCX245 An, Bn Bn, An 1.5V 1.5V tPLH 1.5V tPHL 1.5V WAVEFORM 1 – PROPAGATION DELAYS tR = tF = 2.5ns, 10% to 90%; f = 1MHz; tW = 500ns 2.7V 0V VOH VOL OE, T/R An, Bn An, Bn PULSE GENERATOR 1.5V 1.5V tPZH tPHZ 1.5V tPZL tPLZ 1.5V 2.7V 0V VCC VOH – 0.3V ≈ 0V ≈ 3.0V VOL + 0.3V GND WAVEFORM 2 – OUTPUT ENABLE AND DISABLE TIMES tR = tF = 2.5ns, 10% to 90%; f = 1MHz; tW = 500ns Figure 1. AC Waveforms VCC DUT RT R1 CL RL 6V OPEN GND LCX DATA BR1339 — REV 3 TEST SWITCH tPLH, tPHL Open tPZL, tPLZ 6V Open Collector/Drain tPLH and tPHL 6V tPZH, tPHZ GND CL = 50pF or equivalent (Includes jig and probe capacitance) RL = R1 = 500Ω or equivalent RT = ZOUT of pulse generator (typically 50Ω) Figure 2. Test Circuit 5 MOTOROLA 5 Page

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